Update Python 2 dependency declarations to new packaging standards

sympy.spec

@@ -1,6 +1,6 @@
 Name:           sympy
 Version:        1.1.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        A Python library for symbolic mathematics
 License:        BSD
 URL:            http://sympy.org/
@@ -13,14 +13,14 @@ BuildRequires:  gettext
 BuildRequires:  graphviz
 BuildRequires:  ImageMagick
 BuildRequires:  librsvg2-tools
-BuildRequires:  numpy python3-numpy
-BuildRequires:  numpy-f2py python3-numpy-f2py
+BuildRequires:  python2-numpy python3-numpy
+BuildRequires:  python2-numpy-f2py python3-numpy-f2py
 BuildRequires:  python2-devel python3-devel
 BuildRequires:  python2-docutils
 BuildRequires:  python2-fastcache python3-fastcache
 BuildRequires:  python2-gmpy2 python3-gmpy2
 BuildRequires:  python2-matplotlib python3-matplotlib
-BuildRequires:  python-mpmath python3-mpmath
+BuildRequires:  python2-mpmath python3-mpmath
 BuildRequires:  python2-scipy python3-scipy
 BuildRequires:  python3-sphinx
 BuildRequires:  python2-theano python3-theano
@@ -44,8 +44,8 @@ Requires:       mesa-libGLU
 Requires:       python2-fastcache
 Requires:       python2-gmpy2
 Requires:       python2-matplotlib
-Requires:       python-mpmath
-Requires:       python-pyglet
+Requires:       python2-mpmath
+Requires:       python2-pyglet
 Recommends:     python2-scipy
 Recommends:     python2-theano
 %{?python_provide:%python_provide python2-%{name}}
@@ -260,6 +260,10 @@ popd
 %{_docdir}/%{name}-doc/html
 
 %changelog
+* Wed Feb 21 2018 Iryna Shcherbina <ishcherb@redhat.com> - 1.1.1-4
+- Update Python 2 dependency declarations to new packaging standards
+  (See https://fedoraproject.org/wiki/FinalizingFedoraSwitchtoPython3)
+
 * Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 1.1.1-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild